Connected: An Internet Encyclopedia
RFC 1630 - 4.1.2. Unsafe characters

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### 4.1.2. Unsafe characters

In canonical form, certain characters such as spaces, control characters, some characters whose ASCII code is used differently in different national character variant 7 bit sets, and all 8bit characters beyond DEL (7F hex) of the ISO Latin-1 set, shall not be used unencoded. This is a recommendation for trouble-free interchange, and as indicated below, the encoded set may be extended or reduced.

Next: 4.1.3. Encoding reserved characters

Connected: An Internet Encyclopedia
RFC 1630 - 4.1.2. Unsafe characters